Upstream's tarball without repacking contains build dependencies in the
vendor/ directory. Since Debian's golang-github-docker-containerd-dev
and golang-github-docker-docker-dev packages are outdated but need to
be updated in sync this package readded those Go libraries with the
version embedded and supported by upstream as additional original tarballs.

Upstream's unmodified tarball contains a lot more dependencies than the ones
repacked as additional tarballs. Repacking the listed subset instead of
keeping them under vendor/ allows debian/rules to stay more similar to
debian/rules of go packages which are free from vendored dependencies.

The relevant part from upstream's vendor.json which identify the embedded
versions:
...
		{
			"checksumSHA1": "NiGzxaGjrwCVu8myufBV40NGzHI=",
			"path": "github.com/docker/containerd/sys",
			"revision": "26183b3a69a36f426785cdefe1bc9e8e233596d1",
			"revisionTime": "2017-05-25T18:40:16Z"
		},
		{
			"checksumSHA1": "E7RpPmZzz3Zj562T01hY/jtlKs0=",
			"path": "github.com/docker/docker/pkg/archive",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "/rhDgzb51QH29Dn6v9lr/NQrLbs=",
			"path": "github.com/docker/docker/pkg/fileutils",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "5UI7YJZQYPQhSj3HTUT6h5j7SeE=",
			"path": "github.com/docker/docker/pkg/idtools",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "jsjQr20W2W6Gewf8Un3D8IKu2I8=",
			"path": "github.com/docker/docker/pkg/ioutils",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "ndnAFCfsGC3upNQ6jAEwzxcurww=",
			"path": "github.com/docker/docker/pkg/longpath",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "OftwMeqd/CPdOXNrCD99oKui8YE=",
			"path": "github.com/docker/docker/pkg/mount",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "cS0+jrjme0j9GX8LLcioQ7ZOBsQ=",
			"path": "github.com/docker/docker/pkg/pools",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "txf3EORYff4hO6PEvwBm2lyh1MU=",
			"path": "github.com/docker/docker/pkg/promise",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "YdUAOhhc/C0zu+eYrJOJjDwr1/4=",
			"path": "github.com/docker/docker/pkg/symlink",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
		{
			"checksumSHA1": "Aa2l7tUYFCEvHd+C//15fQnAfqQ=",
			"path": "github.com/docker/docker/pkg/system",
			"revision": "4f3616fb1c112e206b88cb7a9922bf49067a7756",
			"revisionTime": "2017-07-26T22:03:47Z"
		},
...

When Debian's golang-github-docker-containerd-dev and
golang-github-docker-docker-dev is updated to a compatible version the addiional
original tarballs should be dropped.

 -- Balint Reczey <rbalint@ubuntu.com>, Fri, 15 Dec 2017 13:37:17 +0100
